unable to change the security properties on PDF file to password protect it

I have PDF file I scanned. I am unable to change the security setting to add password it it.

Here is link how to password protect it and also the screenshot for the gray'ed out security propety.

I have already tried. File Save As PDF and it still didn't work.

Guide To add password.

5

2 Answers

Print it to another PDF. Open that PDF and then add the security you want.

2

If you are really in Acrobat (see comment above), check the settings for PDF/A viewing mode. You find that in the Documents tab of the Preferences: View Documents in PDF/A mode, and set it to Never. As you say they are scanned, it is possible that the scan software creates (or pretends to create) PDF/A documents.

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